x
2
+
y
2
=
16
...
...
...
...
...
...
.
.
(
1
)
x + y = 4 (2)
rearrange (2) to y = 4 - x (could do x = 4 - y )
substitute y = 4 - x into (1)
hence:
x
2
+
(
4
−
x
)
2
=
16
⇒
x
2
+
16
−
8
x
+
x
2
=
16
and
2
x
2
−
8
x
+
16
−
16
=
0
⇒
2
x
2
−
8
x
=
0
factor and solve : 2x(x - 4 ) = 0
⇒
x
=
0
,
x
=
4
substitute these values into y = 4 - x , to find corresponding values of y.
x = 0 : y = 4 - 0 = 4 → (0 , 4)
x = 4 : y = 4 - 4 = 0 → (4 , 0 )
These are the points of intersection with the line x +y = 4 and the circle
x
2
+
y
2
=
16
Answer link
Объяснение:
#include <ctime>
using namespace std;
int main ()
{
srand (time(NULL));
setlocale (0,"russian");
int N;
cout << "Кол-во чисел: ";
cin >> N;
int *array=new int [N];
cout << "Массив: ";
for (int i=0;i<N;i++)
{
array[i]=rand()%30;
cout << array[i] << ' ';
}
int x=1;
for (int i=0;i<N;i++)
{
x*=array[i];
}
cout << "Произведение: " << x;
system ("PAUSE>>VOID");
return 0;
}